Unsigned Florida SR#'s along US and Interstate Highways
There are many locations throughout Florida where The Florida Department of Transportation and Department of Highway Safety & Motor Vehicles (including Florida Highway Patrol) use designated State Road numbers along US highways and interstates for administrative purposes only. In these cases, you will not find a single sign in the real world reflecting the SR #. For example, FDOT and FHP refer to I-10 as SR-8, yet you will never find a single "SR-8" sign posted anywhere along I-10, or anywhere else in Florida, in this case.
Unfortunately, this is not true everywhere. For example, stretches of US-441 in South Florida do have "SR-7" signs posted as well.
Also, there are some locations, such as where I-4 ends at I-95 in Daytona Beach, that the corresponding SR-# (SR-400 in this example) continues beyond the terminus. You will never see a "SR-400" sign anywhere along I-4, just along the non-highway extension.
As is often the case, always defer to what the street signs say in real life. Use Street View to sample a few intersections and segments near intersections to see if the corresponding SR-# is signed or not. If there are no street signs with that SR-# in the real world, do not list it in Waze. If it is signed, determine if it should be Primary or Alt based on what the green street signs say at intersections. (e.g. SR-400 in Daytona appears as "Beville Road" on green street signs. "Beville Rd" is primary, "SR-400" is Alt.)
Although not an official listing, this Wiki Page indicates in the Notes column where this guidance should apply. "Carries _____" generally implies that you will not see the corresponding SR-# signed in the field. "Mostly carries" is a good hint that it may be co-signed and/or the corresponding SR-# exists in segments beyond its US or Interstate partner.