It's very unlikely that the Cobra factory left the intermediate footstrap inserts out of your GO 155 completely.
My guess would be that they probably put the inserts in, but neglected to open up the holes through the EVA deck material.
If you can send me the serial number from your board (should be on the underside of the nose just behind the "handle") (use the "private message" feature on this website for security) I will see if I can find out exactly where they would have placed the intermedaite FS inserts in your board.
I responded to Tom W. (from your ABC club) about ways to detect FS inserts under the EVA deck, so he may be able to help your find them and get them opened up so you can use them normally.
Hope this helps,