My snowboard had plastic letters on the bottom and some fell off so what should i do to fill where they were?

What kind of snowboard company puts letters that can fall out on the bottom of the board? Oh, well. Depending on how deep of a hole is left by the letters you may be able to fill in the holes with P-Tex. If you don't know how to do this take it to a ski shop and have a tech do it for you. Hopefully the board can be saved.