Running SEER 14 as SEER 16?

TLDR: Agreed to and paid (more) for SEER 16, unit says "SEER 14*" ("*...may be better depending on coil"). How does one determine what SEER I actually have?

DETAILS:
Got on-site quotes from HVAC company for SEER 14 and 16 AC units (2 ton).

Opted for more expensive SEER 16.

Unit installed was a Goodman GSX16 (GSX160241) with a yellow Energyguide label reading
"Goodman Manufacturing Company, LP
Model GSX160241FJ
Efficiency Rating (SEER) 14*
... *Your air conditioner's efficiency rating may be better depending on the coil your contractor installs."

New coil atop furnace reads
"Model No. CAPFA2318A6BA
Serial No. ...
U.S. Alumacoil Manufacturing Company, L.P.,
... Waller, TX
... Design PSIG High 450, Low 236, Test PSIG 450
... SR067 ... Refrig: R410A or R22"

I've located the "Goodman Technical Manual GSX 16 SEER Condensing Units" and the "SS-DCoil" manual from Daikan (backend daikincomfort "site"), the latter which on page 5 lists...
Model: CAPFA2318A6
Cabinet Dimensions Nominal (W D H A): 14" 21" 18" 14"
Tons: 2
Connection - Liquid, Suction: ⅜”, ¾”
Piston Size* (in.): 0.057
Ship Weight (lbs): 33

I can see a few possibilities:
- Sold 16 (nominal) but have 14 (actual).
- Sold 16, have a 14-running-like-a-16.
- Sold 16, 14 installed, tests required to calculate what Actual SEER is (14, 14.7, 15.2, 16, ...) i.e. BTUremoved / watt-hours (DIY possible?).

I'm having rhyming memories of the various horsepower ratings for cars over the years (lab with no accessories, at crank, at wheel, etc.).

source https://hvac-talk.com/vbb/threads/2240717-Running-SEER-14-as-SEER-16?goto=newpost