It's a shame that seller was dishonest, claiming it's complete, but missing a part. Wonder if it was sold "as-is".
You might want to check the size of the bits. They may be a standard size, and that extender could be found at a local hardware store in your area, and modified to fit in the knife. Most screwdriver bits here in the USA at least come in 1/4 or 1/8 size, and many multis have bit driver that fit that.
Still a pretty nice knife. I've long wanted one myself. Never seen an Eddie Bauer edition of it before. Thought that was only standard models with a screwdriver in place of the nail file or second blade.