The numbers stamped on the case of Roach Pheromone Traps (M330) indicate the year, day of year, and shift the product was made. For example, "172611" indicates 2017, the 261st day (Sept 17), and 1st shift.
The Roach Pheromone Traps (M330) - CASE (96 traps) are only available in the case of 96. An alternative would be Trap A Roach Hoyhoy Cockroach Glue Trap, which comes in a pack of 5 traps. These use a food bait rather than a phermone.