Lost Passport with Schengen visa in France - need to travel to Italy - Applying for a new Schengen from Italian embassy while in france

I still can't offer a full answer but I can hopefully clarify a couple of things:

• You won't receive any stamp by going through Switzerland, the consulate is definitely wrong about that. That would be an issue if you would have to leave the Schengen area (that's definitely not possible without a visa) but France, Italy and Switzerland are all in the Schengen area so there are no systematic border check between them.

  Maybe they misunderstood your friend or they thought Switzerland is not in the Schengen area (would be quite disappointing that someone working in the diplomatic service would not know it but many people are confused about this as Switzerland is a bit of a special case: they joined later and, unlike most other Schengen countries, are not part of the EU).

• Notice that I said no systematic border check but the French-Italian border has become notorious for ostensibly ‘random‘ checks (although possibly more in the South than around Grenoble) so it's entirely possible that the police will want to see your visa. (A préfet even recently gaffed on TV by essentially admitting that the police did perform checks at the border in the presence of the prime minister and then quickly correcting himself by adding something like “huh, I meant ‘non-systematic‘”.)

  To the extent that the Swiss-Italian border is less intensively patrolled (if it is, which is unlikely because Swiss border guards still maintain a presence for other reasons), going through Geneva could in fact help but alas the most logical route from Geneva to many places in Italy goes through… France. So you would actually be crossing three of the most sensitive internal borders during the trip (by contrast, I have never seen a Belgian border guard in my entire life and I cross that country frequently as well).

On the other hand, travelling with a group of people in a private bus might actually be to your advantage. They do check public transportation (regular bus lines and especially trains) and occasionally take a glance at private cars but I don't think they often inspect touring buses. I don't really know, however.

I don't think being in Italy makes any difference legally speaking, you would still be in the Schengen area under the cover of your Schengen visa but with no easy way to prove it. But crossing borders does increase the likelihood of a check, even within the Schengen area, and since all you have is a police report written in French, explaining your situation would be a little more complicated outside of France.

I also believe the details of your visa should still be recorded in a database called the VIS so that should be enough to avoid serious consequences but you could be in for some serious unpleasantness before they even get to check that and accept your story.

• You most likely won't be able to apply for an Italian visa in France. You are not a resident (you're on a short-stay visa, even if you lost it) and it's usually required to be one to apply for a Schengen visa. You would even have to present documentation to that effect for a consulate to examine your application. Besides, your French visa is still valid, and as I said, recorded in the database so I don't think Italy would issue another overlapping Schengen visa.

  One reason the Italian embassy does not offer much info on all this could be that very few people are in a position to apply for a Schengen visa for Italy from France (although this eventuality is explicitly considered in article 7 of the Schengen Visa Code) because if you are legally present in France, you either already have a Schengen visa or you don't need one. In the first case, you would not need to apply for another one because your visa covers both countries. In the second case, it usually means you are a resident in France but then you already have the right to go to Italy without visa using your French residence permit, so you don't need to apply for a Schengen visa either.

So in summary I don't see anything that would unambiguously forbid a trip to Italy but in practice it would indeed seem prudent to stay in France. Unfortunately, I can't tell you more than that but maybe someone else will.