Here's an update in case someone comes across this as I did.
The below data is taken from the Tracking Web Service Developer Guide (January 9, 2017).
You should be able to access it from the UPS Developer Kit download page. There's a section called Download the API
with a link to download Tracking.zip. The developer guide is located at Tracking.zip\Tracking\Developers Guide\Tracking Web Service Developer Guide.pdf
The table is located on page 7.
"Type","Value","Option","Service","Response"
"Tracking","1Z12345E0205271688\n(Signature Availability)","Activity (All)","2nd Day Air","Delivered"
"Tracking","1Z12345E6605272234","None (Last)","World Wide Express","Delivered"
"Shipping","1Z12345E0305271640\n(Second Package:\n1Z12345E0393657226)","None (Last)","Ground","Delivered"
"Tracking","1Z12345E1305277940","None (Last)","Next Day Air Saver","ORIGIN SCAN"
"Tracking","1Z12345E6205277936","Activity (All)","Next Day Air Saver","2nd Delivery attempt"
"Tracking","1Z12345E020527079","None (Last)",,"Invalid Tracking Number"
"Tracking","1Z12345E1505270452","None (Last)",,"No Tracking Information Available"
"Tracking",990728071,"Activity (All)","UPS Freight LTL","In Transit"
"Tracking",3251026119,"Activity (All)",,"Delivered Origin CFS"
"MI Tracking Number",9102084383041101186729,"None (Last)",,
"MI Reference Number","cgish000116630","None (Last)",,
"Tracking","1Z648616E192760718","Activity","UPS Worldwide Express Freight","Order Process by UPS"
"Tracking",5548789114,"Activity","UPS Express Freight","Response for UPS Air Freight"
"Tracking","ER751105042015062","Activity","UPS Ocean","Response for UPS Ocean Freight"
"Tracking","1ZWX0692YP40636269","Activity","UPS SUREPOST","Response for UPS SUREPOST"
Hope that helps the next person to come along :)