SP-API getOrder – TaxCollection.Model is not always present

I’m getting orders using the getOrder API, and I noticed that TaxCollection.Model is not consistently present.

I want to differentiate orders that are MarketplaceFacilitator from the ones that are not.

TaxCollection.Model seems to be more consistent in North America (but it is not always present). For orders in the UK, we noticed some orders that were MarketplaceFacilitator that did not come with the attribute present.

Any ideas or recommendations to identify MarketplaceFacilitator orders?

I’m importing this data into an external system, and I need to break down the tax liability.