Missing Naval Aviator Sign

I live in the 300 Block of I Avenue. Twice this week, my husband’s Naval Aviator sign has gone missing. It was “returned” to its proper place, only to have gone missing again last night. We are hopeful that it will come home again, but would like to know if this is an isolated incident, or if this is happening elsewhere on the Island? If so, can the signs be replaced (we are aware of the Boy Scout project and know this is unlikely)? While maybe not valuable monetary-wise, I think it’s obvious that the signs are symbolic of the pride one holds when having earned the title. Thomas is Aviator #363.