Collage.com has made it easy to check the value of any purchased voucher.
To find out if there is remaining credit on any voucher, log in to your Collage.com account, then click , and finally "Your Vouchers."
This will take you to your voucher page. Here you can enter any code you have to check remaining value and expiration date.
There will also be a list of codes you've purchased directly from Collage.com in case you lose track of your codes.
Note: you can look up the value of third-party purchased Collage.com codes with the lookup feature if you have your code, but the code will not show up in the 'Your Vouchers' section. If you don't have your Groupon, LivingSocial, or other 3rd party voucher, please contact them directly for retrieval.