This was the WR conundrum that kept me up last night

Is there any way to put a hold on package delivery through UPS/ FedEx? We've asked for gifts to be sent to our house, but we will be away for about a total of 3 weeks around the wedding and I don't want anything sitting out on the porch that long.
I've tried t get in touch with both companies. FedEx has responded, but with pointless, frustrating answers- They just do not get that I have no idea where packages would be coming from, what they are, who they're from, or if anything would be coming at all. SO frustrating.
Anyone have any ideas?