Originally Posted by
EditHeavy
I can't speak as to the workability of this exploit, but here are some tools you can use if you intend to make a fake receipt yourself:
This is the best font I could find to emulate receipts
fontspace.com/cumberland-fontworks/merchant-copy
...And here is a .psd I made for a fake one
media fire.com/download/x842zkbfr6x5ws9/Steam_Receipt.psd
If this isn't working for people, I'm going to guess that Steam can verify these codes whether or not they were activated, and since you're all just typing gibberish, it's obvious that they aren't actually valid. I'm going to go with accidental partial destruction for mine. Inkblot, coffee, etc.