It could have shipped with a Mercs kit as Capcom contracted this company along with Dynamo to place their kits in cabinets for shipment. Not sure if Mercs meets the time frame or not.
Thanks! I'm glad to hear it, I got this one to make a Raiden II cab (with custom artwork) out of and wanted to make sure that I wasn't desecrating a rare game or classic that I should pass along to be restored or something. Awesome!