Bump
I think I can help. I went to Kivrei Tzadikim in Metz, Ramerupt and Troyes about 5 years ago. At the time I went, I did some research and at that time no one knew where exactly Rashi is buried. There is a place in Troyes where they think he may be buried and someone (the town??) has put up a memorial there but there is no confirmation that he is buried there.
About a 20 minute drive from Troyes is Ramerupt, where there is evidence/a tradition that the Baal'i Tosfos lived and were buried there. There is a small house with a courtyard where supposedly the Rashbam, Ri, Tosofoes Ri HaZakan, and the Rivah are buried. There are maztoivis with their names on it, and from the research I did before I went it seemed to be accurate that they are buried there.
Metz is IIRC about a 2 hours drive from Ramerupt/Troyes and I believe the Shagas Aryeh and other tzadikim are buried there. Not 100% sure of that though.
I'm going to try to post some pics of Rashi's memorial in Troyes and of Ramerupt. Let me know if you have any questions.