NAC auction import guarentee

Many collectors are looking with amazement at the catalog for the upcoming part 1 of the RBW collection. The catalog can be downloaded in three parts from Numismatica Ars Classica.

Numismatica Ars Classica is offering an import guarentee to US customers. This is the first guarentee of this type that I have seen, but I expect such guarentees to be increasingly important. Here is the guarentee:

The RBW Collection is an American collection and all of the coins that make up this collection were outside Italian territory prior to 19th January 2011. Furthermore, almost every item was exported from the United States using a special procedure: Certificate of Registration (CBP Form 4455), which proves American provenance,
therefore none of the coins offered in this sale are subject to any kind of US
import restrictions.

Nonetheless, Numismatica Ars Classica NAC AG endeavours to provide its American clients with the best service possible and we will therefore take it upon ourselves to carry out all of the customs formalities for importation into the USA and will then ship the lots to each individual client from within the United States.

NAC guarantees importation to the US of any coins purchased in this sale.

Blank copies of “Form 4455” can be downloaded from the US Customs web site.

I was previously unaware of this procedure. Has anyone tried it? Could I take my collection to Toronto for a long weekend to prove its provenance for the future?