Doubtful anyone other than the person you purchased from will be able to confirm with 100% certainty the authenticity of the item you purchased. While highly unlikely a replica would have such detailed information, it's not completely unreasonable that a replica manufacturer would include this...
I've had my SR5 Premium for almost a year and frequently find myself wishing I had gone the step up to OR. One day I'll 'simplify' like you and make the jump :cheers: