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These are Arris BPB026S 8.4vdc 2600mAh Modem Battery Packs brand new un-used still in their wrapper. They typically contain 2 Samsung ICR18650-26f cells. Modem packs are great for harvesting 18650 cells as they typically have very low cycles, and sometimes they even have zero cycles like these new ones. To harvest the cells you have to crack packs open and extract the cells, you'll have to cut and clean the Nickel interconnects using snips.
Once the Cells are out and clean you will have to test them using a charger like this.
Typical Capacity: 2600mAh Nominal Capcity: 2500mAh Diameter: 18mm Length: 65mm Voltage nominal: 3.6V Charge voltage cut-off: 4.2V Discharging cut-off: 2.5V