Filtration Change Prior to Flush-out

On one project, the GC replaced construction filters at AHUs with final filters two months ago. However, delays in TAB and commissioning has delayed the start of the building flush-out. During this time, only TAB and commissioning, and no other construction work has been performed. My general feeling is that due to the two month lapse, the filters should again be replaced prior to beginning the flush-out, which is now due to begin in a week. However, I cannot necessarily confirm the need to for the GC to do this based on information presented in the LEED reference guide. Has anyone else had a similar situation and can provide some feedback?