What does it say on the bottom of the cart under the silicon cap?
You can get SS/Glass carts from Jupiter and AVD. Either of those will have either CCELL, model info or AVD model info on the rim at the bottom of the cart.
I’m getting mine name brand for right around 1.89 each shipped to me (that’s the cart body and an ez-press cap). I buy them in batches of 10,000 to 100,000 depending on the time of year. So 1000 for 1600 seems like a totally normal price, maybe even on the low side. Does that include shipping and taxes?