That's the one case you have the facts about , NOT every case is the same .
A career thief may not know anything about fishing so how would he know what the good items are ?? The fact is thieves will and do turn up in a van and just empty a garage , shed storage etc , they may not even sell the items direct themselves and not all stolen items are sold at bootsales they are sold through every platform .
Don'y be so blind to accept other scenarios and facts just because you have not heard of it happening .