No offense, but you think perhaps a person with just the expense of feeding and caring for over 600+ animals could invest in a security camera or two? If not simply to deter a thief from the onset of such an idea as he's crouched at your door and looks up to find he's on candid camera? Sounds like a wise investment to me given the value of what was stolen and considering its already been twice. Two or three cams are chump change to protect that kind of investment and keeping your mind at ease.
Give this tip to Zelph. Tell him to fill a large glass jar (big enough to fit your whole hand in) with money (singles, fives, tens, and some change). Do not use a small jar because the thief will take it with him. Anyway, leave it in an open area that you know anyone coming in the house can see it in plain site. Should he get robbed again it is without a doubt that thief will grab that jar to empty its contents into his pockets. You will now have his fingerprints on the jar so do not touch the jar.
Cops love it when they get to use thier dusting kit.
Good luck