No way you should get a bad feedback for a freebie card...he must've really not wanted any extra inventory.
In terms of what to do with the junk cards...try crafts for kids. I got little ones and they love to glue things together, cut out shapes. Use some poster board (or if you don't want to spend any money) use any old cardboard and get crafty...the kids love it, the cards are kind of going to good use and at least they don't end up in a landfill. You never know, you may like the collage you get out of it and it will sell as abstract art on eBay!!!
In terms of what to do with the junk cards...try crafts for kids. I got little ones and they love to glue things together, cut out shapes. Use some poster board (or if you don't want to spend any money) use any old cardboard and get crafty...the kids love it, the cards are kind of going to good use and at least they don't end up in a landfill. You never know, you may like the collage you get out of it and it will sell as abstract art on eBay!!!