I've cooked something like 20 of the cryopacked pork shoulder roasts from Costco in the past two months. Both pieces are the (boneless) butt portion of the shoulder. I've kept fairly close track of my net returns on finished product vs. the weight printed on the sales label and I'm consistently ending up with around 42-45%. Seems like I do a little better if I foil vs. not and keep in mind that I am extremely thorough about eliminating fat, grisel, etc. from the finished product when I'm pulling, so that may contribute some to the lower returns, but I thought you should know. Good luck and enjoy! Take some pics for us if you have time and please let me know what sort of returns you get on finished pig.