Just to clarify, it is a hoard of 1471 mid 4th century nummi. Most of the coins were initially recovered by the two finders; I was then called the next day and came out and did an excavation, recovering some pottery and more coins in the process.He then adds:
The detectorists dug out the coins and then filled the hole in. The excavation was entirely my work (I think it was 2m by 2m). I'm not sure which photos you are referring to but if they show a man in a square hole, they were taken the following day.
The photographs appear here.
So it seems that the detectorists dug a 1 m deep hole in the dark to recover most of the coins and that Julian Watters investigated the disturbed find-spot the following day.
The hoard is not yet on the PAS database as that will be upgraded in the new year.