Traffic light mulberries?

I am seeing a lot of strawberries and mulberries being sold at traffic lights. Last night a guy was practically begging me to buy the last 3 mulberry boxes for 150. Even though I was skeptical, I bought it cuz A) I felt bad for him B) everyone at my home loves them especially my dad who has diabetes But after coming back home I started having my doubts. My friend said he visit their godown once and it was all sewage. Like, you'd vomit if you visited it. Washed them thoroughly thrice. Idk, can someone help me out? Don't wanna endanger the elders and kids' healths. Thanks