When I first started selling on ebay if I saw something at a thrift that I thought might sell I would hide it & look it up before I bought it. Yard sales are good because you can get a box of stuff for a few dollars & take your chances without risking your $. I recently got a box of vintage sewing patterns for 2 dollars at a yard sale, not being an expert in patterns I was willing to take a box for that amount. Turned out to be a good investment. This pattern sold for 200 dollars, several others for 70-80 dollars, probably made about 500+ dollars from the whole box. Wish I could find stuff like that all the time!
I was given a few boxes of very nifty vintage patterns at a nursing home's yard sale. Noone was buying any so they told me to take them if I wanted to. They run from the 1930's to the 70's. Some are uncut. But I know nothing at all about their value. I had no idea they could go for so much. Did you ebay yours? I think I have something to look into now........
p.s. sorry to threadjack april