http://www.travelnotes.org/NorthAmerica/distances.htm
Link to a site that calculates driving miles between cities.

From Charlotte to Denver is about 1580 miles

50 MPH average rate X 8 hours drive time/day equals 400 miles traveled
1580/400 = 4 days by truck drive time
Plus
Time from manufacture to warehouse: 1 day
To loading dock: 1-2 weeks
Truck time: 4 days
delivery time, wholesale center/bulk retailer warehouse to retail store: 1-2 days
From stock room to retail shelf: 1-2 days

It looks to me that the tape could have made the trip to Boulder in 2-3 weeks
without a problem. A drop shipment from the factory to Boulder could have shaved
a few days off this. And yes, merchandisers know when the peak sales times are for
different products and when to order them to be on hand-most of this is computerized.

I would have searched Shuretapes files for purchases and shipments to the Boulder/
Denver/Colorado area for that time frame