If you have a lot of samples you might find our interactive freezer boxes useful:
http://support.quartzy.com/kb/inventory-module/interactive-f...
http://support.quartzy.com/kb/inventory-module/managing-loca...
http://support.quartzy.com/kb/inventory-module/managing-loca...
This is what I meant when I said in my original comment that I think this problem is a difficult one, because so many different scientists are using so many different types of inventory. But I'm sure it's possible, and I wish you luck :)
[1] e.g. http://scienceservices.eu/media/catalog/product/cache/1/imag...