Any way to drop off a UPS shipment in FRA
 

It's probably a lost cause but is there any way to drop off a UPS shipment in FRA in the weekend without it taking more than 60 minutes?

I'm connecting in FRA on both Saturday and Sunday. I have a 2-hr layover, and while the nearest drop-off points are only 1 S-Bahn stop away, one closes on Saturday at 2 PM right before I arrive, and the others are closed all weekend long. Going further in the city would introduce a risk to miss my flight connection due to the extra time required.

There's a UPS operation on the south/cargo side of FRA, but I'm not sure if they accept drop-offs there and if it will be open on weekends. I know DHL/Deutsche Post would be much easier, but unfortunately, that's not an option in this case.

FWIW I know my way in FRA, and I travel in C with UA*G status.