I do not have any updates. Except this one:
I would only suggest to make sure that the usage on the piechart of your storagenode dashboard is correlated to the actual usage on the disk.
The Average Used is not reliable to come to conclusion about what’s really accounted by the satellites due to lack of several reports from at least two satellites.
I do not have a solution or a workaround how to calculate the amount of uncollected garbage. You may calculate an average, but you need to exclude the missing reports (this is a tricky one - you obviously should exclude the zero ones, but also, which lower than a previous and the next report too - because it’s likely incomplete, so only fully reported should be included to calculate an average). Perhaps it would be simpler to take a last full report as an average. But I believe that the @BrightSilence’s script uses exactly that already.
I can only suggest to take a look on your previous period in the Payout Information, it contains real numbers reported from the satellites and paid (it replaces the estimation numbers when the satellites sends a payout receipts after the first two weeks every month).