Mine were safely stored in a drawer below the av unit, so I suspect it’s more a question of potential bleed thru for mine.
I only sell things I can feel confident buyers will be quite happy about. I always offer unconditional refunds on anything I sell.
1 r2r tape box was destroyed (so bad it seemed purposely) by PO (tape lived). One early one I sold, the heavy tape inside moved and broke a corner of the box, I learned to put peanuts in the corners to prevent that. 2 refunds out of around 150 tapes sold, many LPs sold, some equipment sold.
I got tired of only making 3 or 4 dollars for the fairly common LP’s on ebay. Then inherited 4,000, sorted, gave many to friends, including 4 new friends from audiogon. Then sold a few thousand to 4 dealers who came here.
I might get back to selling stuff after the holidays.