I have a bunch of old USB sticks, HDDs, phones, tablets, etc in my garage because I can't wipe them, but I can't possibly remember what data was stored on them

I have a bunch of old USB sticks, HDDs, phones, tablets, etc in my garage because I can't wipe them, but I can't possibly remember what data was stored on them over the years. Micro SD cards are great because they're teeny tiny. Nothing nefarious. I'm just not very trusting with my data, and not going to just hand it over like that.