Oh come on Carana, she would know the how and where of it all, something which is not in the public domain. Foir example it would be interesting to know where they died and where they were waked. Also, if indeed clothing and personal effects were returned to 5a.
You raise some good questions yourself above.
I do remember where gramps allegedly died, and it wasn't in PdL, nor even in PT. However, I really can't be bothered (for once) to hunt for a link. I don't know about granny. *
TS was 12 at the time of the disappearance and therefore no doubt younger at the time of her grandparents' deaths. Whatever personal keepsakes there may - or may not - have been, they may well not have been the sort of thing that one would discuss with a child.
What difference does it make anyway?
If she has remembered other details of potential significance, she may have already contacted OG.
* Double-checking, Ruth McCann's husband died in Liverpool in 2006. I'm no longer sure where Tasmin's grandparents died.