I believe yes.. you’d have to call harbor freight customer service and do it over the phone like you were ordering spare parts.. I DONT know if it would be EXACTLY as easy as just a parts order trying to get specific keys - but i imagine you could always get matching locks with keys.. a couple people here have done it. Ive ordered extra parts for the tools boxes, (shelves for the lockers) over the phone, and with having the part number it was seriously a 5 min painless phone call from start to finish.. it was the easiest parts orders (i did it two times) I’ve ever done..
If you dont wanna call, you can email them, but it takes longer to get a response.. like 2 days i think.. i emailed them to get the parts number, called to order.. it was painless for me to do that.