The only "chained" daggers I'm aware of that had "anodized" scabbards exclusively are the "Type I" examples. There certainly could be exceptions. Many were period repainted because, as previously noted, the finish was not durable and many began to look shabby, depending upon wear, expose, etc. There have been many errors in trying to "compartmentalize" TR edged weapons to "textbook" standards. Exceptions do occur. They may be very rare, but they exist. Most collectors feel more confident with "textbook" examples and rightfully so. However, "legitimate" anomalies occur and each collector must decide on his own whether to add one or more to his collection. Restoring "anodizing" is more complicated and costly than painting or repainting. Most "re-anodized" scabbards I've seen do not look that great. In most cases a paint or repaint job yields better results. Only the restorer knows what the story is on the dagger under discussion.