Do you mean that you suspect it wasnt stolen in the first place?
While I dont have kids myself (yet, I can hear that biological clock of hers ticking away... sounds like the timer inside a suspect package
) I have 2 older brothers both with a boy and a girl each, and they (respetive kids) could not be more different.
While son of eldest brother is lazy, absent minded, lax, carefree, unmotivated and generally a bit of a slob (his sister isnt, strangely.. she is lovely, polite and sensible), the son of the other brother whilst being spoilt by his extended grandparents and numerous aunties on his mothers side, he sees the value of things that he has and wants, to the point where he searches ebay and forums for things that he wants, his bike collection is all second hand, and whatever he wants, he automatically sells something to generate the cash. He has about 40 Scalectrix cars and a ton of track (about 30% of which is actually our old stuff from the 70's and 80's), but if he wants a new car, he will pool his resources and sell some of his old stock to get the cash. He regularly has about 15 things for sale on ebay at any one time