The Mimic/Strategies - OSRS Wiki

Upon completion of an elite or master clue scroll, the casket received has a chance of turning out to be a mimic chest. Mimic caskets can only be obtained from an elite or master reward casket after asking the strange casket to enable the chance to obtain a mimic casket (which is disabled by default).

Sticky' Sanders - OSRS Wiki

The Mimic adds a little extra reward for you : r/2007scape

Amulet of fury - OSRS Wiki

Mimic 2 - Wikipedia

Treasure Trails - OSRS Wiki

3rd Age Pickaxe From Mimic : r/2007scape

Venator ring - OSRS Wiki

Vardorvis - OSRS Wiki

Brimstone ring - OSRS Wiki

Mimic Guide, Athensps Wiki

Trident of the seas - OSRS Wiki

Voidwaker - OSRS Wiki