Thank goodness you found it!
The comment about no trash bags....my husband's hunting buddy put his hunting gear and $1500 binoculars for their hunting trip in a black trash bag and put it close to the front door so he could load it in our truck for their trip.
His wife put it at curbside for trash pickup that morning.
The trash truck was early (rarely happens) and his hunting gear went to the landfill.
Those large zip lock see thru bags work well for transport.
I usually whip up a bright colored cotton storage bag for my quilts....then I can find them.
I know you breathed a sigh of relief! No you can relax and enjoy your Mom's glee when she sees your beautifull quilt.