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Number 4 separate pic shows gold plated connector pins.

#1 - I'm not sure because I have no experience here.

#2 - I would go with low grade telecom specifically because Cisco is a manufacturer of telecommunications equipment, it has gold fingers also. I will assume the connectors are also gold. Telecom / server equipment is higher quality

#3 - My gut is telling me Low grade Telecom in part because of the chip density and gold fingers. Could be gold finger card without bracket but the dollar amount is presently $10.00 verses $11.00 per pound so regardless it wouldn't be far off. That board is light anyway so we are talking pennies difference here.

#4 - I'm going to say this one is a HGP candidate

#5 - My money is on backpane expansion despite having two processors also soldered on. Leave the processors on naturally.

#6 - ...Weird little board but I would put this one is gold finger card without bracket...If you really are pressed you could clip the gold fingers off of this one and remove the connector end. Catalog them as their correct category and the remaining board is going to probably be low grade IMO....

If anyone else chimes in here I would be inclined to take their word for it above mine because these are boards I generally don't come across. But if it were me that's what I would say from a glance. Cheers

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**Please keep in mind that my assessments on board quality are personal in nature

Abbreviations
HGT - High Grade Telecom
LGT - Low Grade Telecom
HGP - High Grade Peripherial
LGP - Low Grade Peripherial
MGB - Mid-Grade Board
LGB - Low-Grade Board