box for antique quilt wedding gift (Dubuque)

I'm giving an antique quilt to give to my niece--the oldest great-great granddaughter of the woman who pieced the quilt--for her wedding this summer.
15" x 18" x 4" are the dimensions of the folded quilt. Something slightly bigger would be fine.
If anyone has a right-sized box in good condition, it would be much appreciated.
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