Vehicle Permit Stciker (TIPS)

We live in Akumal.  Quintana Roo, Mexico.  It truly is our little slice of paradise!

Could you please give me some advice?  We drove from the US to Mexico in November of 2012.  Received a 180 day tourist visa or FMM and also our Vehicle Permit Sticker (TIPS).  It expired on May 18, 2013.  We are planning on going to Chetumal/Belize to obtain a new one.  After searching the internet and reading several articles this is what we have read. 

"if you drive your vehicle across the border to Mexico, and have a permit placed on your car when you receive your tourist visa, that you should never fly home due to the fact that they take that tourist visa and are issued a new one when you arrive back in Mexico. That first tourist visa is connected with the vehicle permit and you will be in big trouble".   We have flown home three times since we arrived and no longer have the original tourist visa but have received a new one each time we have flown back to Mexico.

Do you know anything about this or can you refer me to someone who can help?

Do you know anything about the procedure?  I do however know that we have lost our deposit from the original sticker as it has expired.

Any information would be helpful!

Thanks a bunch!