As we discussed, Nick, as sad as it may be, this is all part of growing up. I'm very sorry for your loss and hope you take comfort in that those who are your friends here are here for you if you need us, and that it's quite obvious your aunt cared for you a great deal.
As to those models, you've already started to clean them up, not a bad idea, just be very careful of that truck, as a lot of cleaners, even mild soaps, can attack the printing.
As to value- considering their source and the family attachment- priceless.
Charlie Larkin