kingOlimbs2 karma2018-12-25 19:37:48 UTC
Are these hand written letters or digital letters (emails)? As someone who likes to write letters to my gf with fountain pens, there is an ink by Noodler's ink called blue ghost that only shows up under black light. So if it is possible to send a physical letter that may be an option. If they are digital then best way I can think is write two letters first one just a normal letter and second one containing numbers that correspond letter characters from the previous letter to spell out and email address or something of the sort that could put you in contact. Might even have to write a third letter just to say hey check the last two again. Best of luck to you.
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