We received the following instructions from the mission office:
LETTERS AND CARDS
Each city where missionaries serve has a post office box where they may receive mail directly. However, there is limited forwarding so if they are transferred to a new city, the letter or card may take awhile to get there and there is a risk that it may never get there. It is fairly safe to send a letter or card the first few weeks following a transfer, but risky in the few weeks prior to a transfer. You can always send a letter or card to the mission office at Cesu iela 31-2k2, LV-1012, Riga, Latvia, and we will deliver it to your missionary at the next zone conference. Do not send money or valuables in letters. Post cards are fine. You can also send letters through pouch mail addressed to Baltic Mission, Pouch Mail, 50 E North Temple, Salt Lake City UT 84150, but be sure to follow pouch mail guidelines. Pouch mail arrives at the mission office and will be delivered at the next zone conference.
Small airmail packages take about 2 weeks to arrive. Packages sent by surface mail can take 2 to 3 months. NEVER INSURE PACKAGES as there will be a stiff customs charge that the missionary will pay from his personal money. Anything over $50 also has a custom charge. In addressing a package, write “Baltic Mission” and then the missionary’s name and the office address. Some postal employees don’t want to give the package to anyone but the missionary to whom it is addressed. If it is addressed to “Baltic Mission” and then the missionary’s name, it might simplify the process.