Don't count on the numbers, in Belgium/Netherlands across several stores numbers with 107 and 108 were given.
Imho this is simply a way to allow the servers to handle a lot of reservations, so server 1 always returns 107* numbers and server 2 gives 108* numbers. That way the load for reservations is easily spread across the two machines without conflicting numbers. I expect the variation to grow ever larger when online reservations become available. 109,110,111,112,113, ...