They don’t want to cross the 400,000 barrier. Sounds worse than 399,000. It is just a marketing technique. Instead of something costing $10, it is $9.99.
The claims number is nearly always revised upward, something that you might find amusing if you know anything about probability statistics. Try running a binomial distribution (coin flip scenario) to see what is the probability of a previous week's number being revised upward 51 of 52 times, as it was last year. The result includes a decimal point with a whole lot of leading zeros....