The difference between pinksugar (...5695) and Swage_17...

The difference between pinksugar (...5695) and Swage_17 (...9418) is 3,723.

The lowest divisible of this is 3, equalling 1,241 orders that day. The next divisible is 17, equalling 219 orders, and after that it's 51, equalling 73 orders. Given 3 x 17 = 51, I'd say this rules it out.

oracleofctown made their order (...3925) the day prior, with a difference of 1,770 to pinksugar. This is only divisible by 3, equalling 590 orders.

The only problem is het_tien_roi placed two orders (...8939 & ...8944) and they are 5 apart.

The difference between #2528944 and #3029418 is 500, 474 and also isn't divisible by 3.

I would say that either order numbers go up in increments of 1, however they use the same system for internal deliveries/orders as well. Or it is somehow randomised as previously speculated.

I also don't think ~3.7k orders in a day is anything spectacular. That's not even $200k. August 20th was also Friday, the day after myself and everyone I know gets paid. It wouldn't surprise me if a huge number of online orders are placed around Thursday/Friday when people's pay hits their bank account.