Are they filled? If not, keep them as spares. Otherwise take them home and use them for your solar system on your house.
You’ll love the e-start stuff until your first battery dies. We buy the cheapest batteries on the planet ($150 for an 8D when I pay $110 for a group 27 for my truck). My boss can’t figure out why they only last 18 months. Carrying the new 150-180lb battery into the engine room sucks. Carry a decent load tester for the batteries, a 400 amp load. The bad batteries almost always show up on the electrolyte test, but that is almost always after a failure to start. For harbor boats, a failure to start is not a big deal but offshore boats it is. In emergency applications with quality batteries the suggested replacement interval is 2 years (Cat uses this number when you use their batteries with their emergency gens). I would expect a lead acid battery to last a minimum of 5 years with a 7 year peak expectancy. So, if your company is willing to buy decent quality batteries you may want to set up a 4 year replacement interval with periodic cell testing and load testing to prevent any failures to start.