Thank you everyone that responded. These responses make me believe that Chris was wrong about the figures I asked about.

I still need to hear more on the last pieces from HL396 thru HL399 and HL 836 and HL837. Does anyone have serial numbers above 550 for HL365 thru HL399 or 350 for HL396 thru HL399 and above 250 for HL836 and HL837?

If I hear about those pieces having higher serial numbers then I will put Chris's theory to bed.