I'll take a brief crack at it, without looking up
anything in ref. material, which could help positive
ID some of it:

Generally, the fact that the devices are labeled implies
they are programmed devices, and the sticker indicates
something of the content which has been programmed
within.



The first sticker batch smells of boot PROMs.
The high/low designator indicates they are to
be installed in the socket for the high-order byte
and low-order byte respectively,  to make up
the 16-bit data bus path.

The LA5.01, LA7.01, and LA7.02 would almost
certainly be the release version of the PROM code,
and the 920803,  921204, and 930126 would be the
date of manufacture. Notice that the dates do increase
in step with the version, so this makes sense.

The 56A2, 90FD, etc. would be the CRC check of the
byte contents of the device.

And lastly, the S/U13  R/U19 certainly looks like socket
number locations on a board. The fact that there are
two different U numbers given might imply that the PROMs
are usable for two different boards, which might be indicated
by the 'S' and the 'R'.

Note that of the four sets, you have two which are identical.



The devices which have 27xxx in the text are standard PROM
devices, and the other text leads would indicate their function
on the board.

The remainders look like PAL devices. (?)




Again, without referring to some of the Sun 3 hardware FAQ
or technical docs, I can't state whether any of these devices
belong to Sun 3 hardware or not.


Have fun,
Rick