I emailed the question through the USO website. I was then told to call the hotel (cabana bay). I was told by them - no problem. Use your reservation # and it will be waiting for you in the luggage area when you check in. I have 3 things being sent to the hotel. pp has me worried now .... hope I don't have any issues.
I also asked them about charges and was told at this time they don't charge. I did this once at the Signature in Vegas and was charged $25 for each package received!!!! Because I'm Canada and don't want to pay duties, I often ship to hotels and its worked great. Most of the time it is with Marriott and I've had no issues and no charges. I can report back in March to let you know how my experience was.