Depth update (beware, somewhat technical re: advanced order...

Depth update (beware, somewhat technical re: advanced order types):
Noticed a hidden sell limit order last Friday 29th, selling to any bids from 36 and up (i.e. 36 is the limit price)
Not shown on the depth, it automatically hits any bids that line up from 36 and higher...
Could possibly have an even lower order price (e.g. 35 or 34 as limit price), but since the next bid was 30, this order price could have been anywhere from as low as 30.5...

Unfortunately for the seller, a single bid lined up with only 2,000 volume, which hit immediately...so I'm expecting them to still be around with an unknown quantity...

Today however, new bid at 36, still waiting...so either the seller is not active today, or the seller is now considering 36 too cheap to sell to and changed the limit price.