Streetfood vendors mostly don't care about sources as long as the goods are good. I had a favorite place before that sold chocolate bars with no markup compared to nearby stores, and I was wondering why they'd even sell them given that chocolate doesnt really go well with their main offerings. Until I witnessed a junkie carry a box to them from the nearest supermarket and it all fell into place. Selling stolen product right across the road might've not worked in their favour though as the place changed hands not long after.