Missionaries love letters and emails. Getting mail really makes their day.
Please write Caleb in the CTM and during his mission.
Packages can't be sent to the CTM but can be sent once he has his first assignment address but most of the good stuff gets lost in customs or with the postman. Check mission blogs for what gets through if you want to send him something.
A note from the CTM:
DO NOT SEND PACKAGES to the Brazil Missionary Training Center. All packages must be sent directly to the mission where your missionary will be serving not the MTC. If you have already mailed a package to the Brazil MTC and it arrives after your missionary has left for the field, please understand that the package can not be forwarded to his or her mission and will be returned to you.
WE STRONGLY ENCOURAGE SENDING HAND WRITTEN LETTERS. Please write your missionary´s first and last name. Your missionary will provide you with his district and box number. Also, please DO NOT SEND ANYTHING BY FEDEX, DHL, UPS, or other private carriers. The cost to get this type of correspondence is exorbitant.