This is a completely bad decision to store the seed phrase (entirely) in a safe deposit box. The bank (their employees) are people who are strangers to you, but at the same time have access to your safe deposit box. If you store the seed phrase in a safe deposit box, then divide it into parts and in different banks.
i don't think they do have access to your safe deposit box. at least the one i saw it has 2 key holes and a key has to go into each one. one from the bank and one from you. and so they can't open it without you. it's not like mail boxes etc where they can reach in your box from the backside 
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Firstly, washers is not for transportation...
that's what you say but what do you end up doing in an emergency? you grab your washers and take them with you right? like a house fire. Quote
Secondly, what’s stopping you from making seed washers on something other than metal (plastic, fiberglass, and anything else that can’t be detected by x-ray), if you want to carry it with you to different countries?
the simple fact that all of your luggage can be searched at any port of entry that's what. they will stand there while you watch and go through every single thing in your handbag or luggage and ask you questions about anything they find while also asking you other things like what's the purpose of your trip and how are you supporting yourself but that's neither here nor there.Quote
Under these pretexts they can check the personal belongings of anyone, which makes the question “why carry seed washers with you?” even more relevant.
because you didn't want to destroy something you worked so hard to make. unlike a simple piece of paper that you can just tear up...Quote
Seed washers is not intended to be carried and taken for X-rays at airports.
well yeah I mean we all agree with that!Quote
Metal washers is a good and effective way to store seed phrases, but in a secluded place for many years.
for many years where? Quote
Don't take washers with you on travel and everything will be fine.
no it might not be. like if you move out of your house and forget to take the washers with you, you can't just exactly sneak back in there once someone new has moved in. and eventually it will be found since it cannot be destroyed. so you put yourself into a bad situation. or lets say you end up in the hospital where you can't go back home. but you need money to pay your medical bill so you have to tell someone where that washer device is so you can pay your bills. hopefully you trust them because if not they can steal your bitcoin. by reading the washers.
i'm not sure if you get it or not but consider this scenario: your house burns down while you're at work. you come home and the fire department is putting out the fire but you can't go back inside. but you HAVE to go back inside AT SOME POINT. even though they tell you not to. because you're worried that your little washer contraption is still in readable condition and you would hate for the fire department or some salvage crew to find it and take your bitcoin. so you literally have to sneak back in somehow and go searching through all the rubble to find that darn thing just so that someone else can't get it! you are in a terrible situation. the only option you have is to stop using that particular wallet, transfer all your funds out of it and create another one. but someone is going to find that thing and know alot about you for one that you are a hardcore bitcoin user and they'll be able to look up all your transactions on the blockchain from that wallet.