The contents of an item cache is randomly generated when it is created. The items that can be selected for the cache depend on its level. If they contain low level items relative to the cache level, they will usually contain more of them.
Level 0+
Energy Drink
Lubricant
Zip Tie
Phone
Rope
Beer
Level 10+
Sprayer
Aphrodisiac
Dissolving Solution
Sedative
Latex Top
Latex Pants
Level 15+
Groin Protector
Trenchcoat
Sensitivity Flask
Level 20+
Fetish Totem
Handcuffs
War Paint
Fox Potion
Bull Potion
Nymph Potion
Cat Potion
Level 25+
Dark Talisman
Summoning Scroll