Krib Sand Castles

[mhancock]

My female crib has built a big pile of sand (play sand about 3cm deep in tank) in the entrance to one of the coconut shells.
 
Is this typical territorial krib behaviour or an indication that there may be eggs in there?

Sorry have posted twice (I didn't think that yesterday's post on my mobile actually made it up)!
 
Please ignore this thread, or mods please delete!