I'm assuming that since these are products that are being returned that you're selling stuff, and if that's the case then you're looking for a "shopping cart" script with a search function built in (which any good script of that type will have). There are free and commercial scripts for this. Look at http://hotscripts.com for what's available. Even if you don't want to offer things for sale or use the ecommerce functions of the script you could always just utilize the search function and disregard the rest of the script.