Just for the record, Lake City Army Ammunition Plant is located in Independence, MO , it's a 3,935 acre facility owned by the government.
Usually marked with LC and the year of manufacture, 17 would mean 2017 , brand spanking new. If the primers are crimped it has not been reloaded and would be 5.56 military grade ammo .
The brass is of excellent quality...I have 45 acp , 7.62 Nato and some 30-06 brass (for M-1 Garand) that dates from WWII through the 1980's , most scrounged from old school Army-Navy Surplus stores...back when they had real surplus.
Shoot it in a rifle that can handle 5.56 mm...I still haven't figured out the 223/5.56mm thing. 500 rounds now that's a nice birthday present ! Good score , have a good time at the range.
Save the brass and decrimp the primers , it's very reloadable.
Gary