1) Give the docs pack to the Front Desk or Concierge.
2) They will make certain they get out.
. . . at The Fort, they are located in The Outpost (check-in building)
. . . at other resorts, they are located in the Lobby
. . . if there is a charge or additional charge, it will be applied to your room
. . . the Front Desk has a rate sheet for all boxes-packages-envelopes if not already pre-paid
3) This same process goes for outgoing US-Mail (USPS), UPS, and FEDEX.
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NOTE1:
If sending a USPS-UPS-FEDEX envelope, just give to Front Desk/Concierge.
If you are sending out a box with items (like gifts or souvenirs), you need to itemize the contents on a form available at the Concierge Desk.
For UPS, if the value is less than $100, itemization is not needed.
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NOTE2:
As an added comment, if you want to send out boxes, the Front Desk can supply you boxes.
If you bring the packed box to Front Desk or Concierge, they will seal it for you.
The box will go out the next USPS-UPS-FEDEX pickup.