Aluminum arbor/pergola kit - $40 (virginia beach)

Metal alumninum arbor/pergola for sale; it is brand new/never used but was sitting under a tarp purchased by the previous owner of our home; I had garage stored as I was going to put it together in the garden or for the kids but have not had the time.
All of the pieces are there including posts, beams, bolts and connectors etc.
Unfortunately when we bought the house there were no instructions left from the previous owner they just left it etc.
I’ve posted a photo of what I gather it’s supposed to look like.
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but full caveat that's just a guess based on the pieces! There are 22 rafters that bolt into the frame are about 5.
5ft long by 6in wide each.
There are 4 posts (which I presume are corners to hold the frame up) and each of those posts are 7ft tall x 4.
5in wide.
The posts are hollow and the opening is about 4.
5" x 4.
5" they have holes which look like screw or bolt holes so presume you could fit a 4x4 wooden post in there for additional stability.
$40