Again, do what you are comfortable with. If your Outfitter is saying to have original boxes to get into Tanzania then by all means do so. You have to feel comfortable.
These are the two sets of marks that are likely to be inspected, if at all, at any border crossing.
As long as they match, you should not have an issue.
These can't be forged. (easily)
There are several other threads where members have been concerned because their favourite "wildcat" (my term for lack of anything more useful) load is in a casing with a head stamp that does not match what is on the barrel.
View attachment 263954
View attachment 263955
My Pelican 12o0 Case using MTM bases to separate the cartridges and keep them safe.
This case configuration made it through 11 international border crossings and customs/police inspections with out a word in 5 countries. Two different calibers of ammunition and two rifles in tow.
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https://www.africahunting.com/threads/importing-handloaded-ammunition.13901/#post-114748
https://www.africahunting.com/threads/ammo-case.24666/
https://www.africahunting.com/threads/ammo-case-locked.28660/
https://www.africahunting.com/threads/lockable-ammo-case.8648/
http://www.africahunting.com/threads/ammunition-box-for-south-africa.10499/#post-81066
http://www.africahunting.com/threads/packing-ammunition-in-a-separate-bag.12609/#post-103810