Heliophobia
Heliophobia is the phobia of the sun..... but also of bright light and a few other enlightening aspects (see what we did there?)
Treatment for humans : prolonged psychotherapy sessions with little success and ultimate wearing of total blackout sunglasses
Treatment for insects : unknown at this stage, although studies have shown significant progress when they are placed in darkness
Treatment for geocaches : limit their exposure to light to maximum 1 minute per day to ensure their longivety
Jokes aside, please replace securely and out of sight. BYOP and wet wipes