Hi Kristin
At best, the date of the transaction will determine which sales bucket is affected. However, because Inventory Period End is generally not date sensitive, the sales history buckets in there may not reflect the transaction dates, if period end is run after transactions dated beyond the period end date are posted.
As Andrew stated, SalesAnalysis is date sensitive, so it will reflect the sales by period properly.
Alternatively, if you own Toolkit for Adagio, you can recalculate the Inventory sales history buckets to adjust those sales history buckets.
Steve