I think this will better belong in trading discussions.

TBH, no. You have absolutely nothing to lose - you have his contacts, you know his address, you have all the cash and still all the hardware. The only person that can even result in a loss in this scenario is the buyer, since he is trusting you to ship the equipment to him once the money orders clear.

I'm not familiar about the money orders in your country. If anything goes wrong, tell him and let him sort it out. Worst case scenario you'll just hae to cut down on the units you are selling.