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You could always have a local bakery recreate the top tier of your cake for your one year anniversary.
This is your best option!!!
The challenge is getting it to where you live in one piece. Airlines are a PITA when it comes to transporting cake of any type. If someone's driving directly from point A to B, then there are options (dry ice in a cooler), but otherwise, really, probably not worth messing with trying to save the top tier... Just plan a real budget for a local backer back home to recreate the top tier at your 1-yr anniversary and it'll be a fresh cake to boot!
My mother saved my cake top for our first wedding anniversary. It tasted like cardboard, after a year.
We had the last of the layer of our display cake for our third anniversary - it actually tasted like it should because my Mom froze it right away in the deep freeze the next day when she got home with it. Then again, it was pound cake, that stuff can be frozen forever and still taste like pound cake...
Fyi - we DID NOT order white pound cake, it was suppose to be spice, but with as many things as that baker messed up, what kind of peeved me the most was she didn't offer us anything in good faith because of it (she messed every dang detail of the cake up from the flavor, to the decoration, to the tiering what was suppose to be a stacked cake, to the color she used for a ribbon around the top tier that wasn't even close to our wedding colors... AND her hand prints were all over the thing to the point you can see them in the pictures! Really - how hard was it to make a smooth-iced, stacked 3-tier spice cake with snowflakes all over!)..
Bummer, I'd hoped to hear an easy solution! hahaMaybe I'll have my parents fly it home to Florida and then bring it home at some point later in the year...The idea of recreating the top layer is a good one, and I might do that if this doesn't work out, but I really would like the original top layer- cardboard taste and all!