The "Inventory Wholesale Value" report just got a new option - it's now possible to enter a date in the past and show inventory levels as they were on that date. This is useful for pulling your inventory levels (and value) at your accounting period end date. You'll find the option button to change the date next to the view option buttons above the report:
By default, the button will be labelled "Today". Click the button to bring up a dialog in which to choose a different report date.
You'll see the date button change to reflect the chosen date and the report figures update accordingly.