Hello,
i am a Baha'i , well the thing is with the seal of the Prophets is that we do agree that Mohammad was last... but last in the Prophetic cycle. A new cycle has begun with the Manifestations of God Baha'u'llah and the Bab. Here is a wonderful website that can answer your question: http://www.bci.org/islam-bahai/SealProphets.htm
Bah?'u'll?h denies the validity of
this concept of finality both in relation to past Dispensations
and to His own. With regard to Muslims, He wrote in the
Kit?b-i-?q?n that the "people of the Qur'?n ... have allowed
the words 'Seal of the Prophets' to veil their eyes", "to obscure their
understanding, and deprive them of the grace of all His manifold
bounties". He affirms that "this theme hath ... been a sore test
unto all mankind", and laments the fate of "those who, clinging
unto these words, have disbelieved in Him Who is their true
Revealer".
(Baha'u'llah, The Kitab-i-Aqdas, p. 243)
We see the Torah, Qur'an and the Bible all equally holy, we believe that all these books were right and morally understandable for that specific time. Their social laws are conflicting, which is quite normal, because everything, the surrounding changes, but the true essence of love and peace remains. Every Messenger of God comes to help and guide the people for a specific time, so for this day and age, we try to abide by the laws of the Kitab-i-Aqdas ( the Most Holiest Book).
Buddha is seen as a Prophet in the Baha'i faith.
Some referred to the teaching of Buddha. 'Abdu'l-Bah? said: The real teaching of Buddha is the same as the teaching of Jesus Christ. The teachings of all the Prophets are the same in character. Now men have changed the teaching. If you look at the present practice of the Buddhist religion, you will see that there is little of the Reality left. Many worship idols although their teaching forbids it.
(Abdu'l-Baha, Abdu'l-Baha in London, p. 63)
The teaching of Buddha was like a young and beautiful child, and now it has become as an old and decrepit man. Like the aged man it cannot see, it cannot hear, it cannot remember anything. Why go so far back? Consider the laws of the Old Testament: the Jews do not follow Moses as their example nor keep his commands. So it is with many other religions.
(Abdu'l-Baha, Abdu'l-Baha in London, p. 63)
I hope i could help you, if you have anymore questions, feel free to contact me!
have a nice day