1. Almost anything can be construed as being contraband under the missionary rules.
2. Most missionaries are fairly lax about the rules, especially when it comes to personal possessions. Most missionaries in my mission had trunks full of stuff they technically weren't supposed to have - "unapproved" music, comic books, guitars, harmonicas, posters, "unapproved" clothing, pin-up calendars, art supplies, pocket knives, toys, pets . . .