H1B Transfer without recent paychecks

The most recent pay stub I have is of August 30th and I have applied for my H1B transfer on October 11th. So you see I dont have September pay stub. But, I have the service invoice of September and time sheets that I worked till date. Would that be enough to prove that I was working during the month of September and October if an RFE is raised?

you should be fine, dont worry.