I am working on a school renovation and consversion of a middle school to an elementary and the old 1930's and 50's parts were razed and the 1995 gym and class rooms addition was left standing and new parts were added to the 1995 part to make a new building. The existing boxes and conduit where left remaining ( wire and devices removed) in the 1995 part and I see no evidence of grounding pigtails and I had to retrofit the boxes with ground pigtail clips when I installed devices. Did the NEC in 1995 require metal box pigtails for bonding?
I am pretty sure they were self grounding and they were spec. grade and we still have allot of old devices in our job site trailer.I am sorry that I don't know the code that well because I am an apprentice but I am still learning.
I imagine there might be some 1&2 family guys who have never used a metal box. I sure don't see them much in residential. Yup, some day you will be telling your young guys how it was way back in the olden days when you actually had to put locknuts on Romex connectors and tighten 2 screws. Then you will get the blank stare and the question "what was this Romex stuff"?
On the construction site I am working on, I am glad to see everything grounded such as the metal framing beams, cable trays, plumbing and even the metal roofing. We even have a lighting protection service subcontracted. By the way here is a link to the pictures of the jobsite below. Click on the date first that says 2003-06 and the newest part you see is the part left standing and new pics should be added soon and this school should be finished early of next month.
just remember 2 important things for surface mounted boxes, first the receptacles must be mounted directly to the box (if you are using an rs cover then you must provide a ground tail) second you must remove at least one of those paper washers that come on the 6-32 screw (if applicable). also if the boxes are flush mounted then you must use receptacles with the spring-type grounding strap.