User blog comment:Dinosaurus1/Lockwood Manor Dioramas are actually early InGen experiments that are taxidermy../@comment-23825763-20180629144843/@comment-23825763-20180629150113

I highly doubt InGen stuffed the creatures. Considering that Lockwood was one of the original creators of the animals, I'd presume he'd have acess to them. Once they died out, I believe Lockwood would stuff them and keep them in his museum as a sort of memento of the species he had helped create that were no longer alive.