My software (BLS Manager/ InSpaceSync) can generate BSX/XML/Excel files for a specific date but only if you have been using the software since that time. It basically tracks all inventory changes and can rollback to a date. Value would be the For Sale or My Cost totals if you keep track of that.
I don't think BrickOwl has that functionallity directly, but you could download a backup file from that date, convert it to BSX and use that to get the total value.
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I don't think BrickOwl has that functionallity directly, but you could download a backup file from that date, convert it to BSX and use that to get the total value.