It's refreshing to actually know the real-life explanations once in awhile. No guessing about unforeseen high water events, anglers with a bucket, or fish transporting birds. Nothing nefarious at all. A simple, human mistake.

Sounds like no damage whatsoever, so all is good.

"Forget pounds and ounces, I'm figuring displacement!"

If we accept that: MBG(+)FGSF(=)HBG(F1)
And we surmise that: BG(>)HBG(F1) while GSF(<)HBG(F1)
Would it hold true that: HBG(F1)(+)AM500(x)q.d.(=)1.5lbGRWT?
PB answer: It depends.