Check your OPLIMs. When mine were issued they included this statement “Compliance with 14 CFR § 91.319(b) must be recorded in the aircraft records with the following, or a similarly worded, statement: “I certify that the prescribed flight test hours have been completed and the aircraft is controllable throughout its normal range of speeds and throughout all maneuvers to be executed, has no hazardous characteristics or design features, and is safe for operation. The following aircraft operating data has been demonstrated during the flight testing: speeds Vso ______, Vx ______, and Vy ______, and the weight ______, and CG location ______ at which they were obtained.”
So I’ve got an entry in my airframe log with this paragraph filled in. There’s no requirement for an E-AB aircraft to actually have a POH or AFM. However I believe it’s prudent to have one, and I do and it’s modeled after a Cessna POH and lists all the pertinent V speeds.