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).

Thanks mimic. : r/2007scape

Armadyl chestplate - OSRS Wiki

Phantom Muspah - OSRS Wiki

Dragon dagger - OSRS Wiki

Mimic 2 - Wikipedia

Void knight gloves - OSRS Wiki

Giant Mimic, RuneScape Wiki

Bow of faerdhinen - OSRS Wiki

Ethereal Mimic - OSRS Wiki

TzTok-Jad - OSRS Wiki

Mimic - OSRS Wiki

Vardorvis - OSRS Wiki

Maps, The Mimic Wiki

Tormented bracelet - OSRS Wiki