diff --git a/src/dns/interface.js b/src/dns/interface.js
index 94841eb9e..9de4cd15c 100644
--- a/src/dns/interface.js
+++ b/src/dns/interface.js
@@ -17,6 +17,7 @@ exports = module.exports = {
 };
 
 var assert = require('assert'),
+    BoxError = require('../boxerror.js'),
     util = require('util');
 
 function removePrivateFields(domainObject) {
@@ -24,6 +25,7 @@ function removePrivateFields(domainObject) {
     return domainObject;
 }
 
+// eslint-disable-next-line no-unused-vars
 function injectPrivateFields(newConfig, currentConfig) {
     // in-place injection of tokens and api keys which came in with domains.SECRET_PLACEHOLDER
 }
@@ -80,5 +82,5 @@ function verifyDnsConfig(domainObject, callback) {
 
     // Result: dnsConfig object
 
-    callback(new Error('not implemented'));
+    callback(new BoxError(BoxError.NOT_IMPLEMENTED, 'verifyDnsConfig is not implemented'));
 }
diff --git a/src/storage/interface.js b/src/storage/interface.js
index 11aed198d..a262d6954 100644
--- a/src/storage/interface.js
+++ b/src/storage/interface.js
@@ -28,6 +28,7 @@ exports = module.exports = {
 };
 
 var assert = require('assert'),
+    BoxError = require('../boxerror.js'),
     EventEmitter = require('events');
 
 function removePrivateFields(apiConfig) {
@@ -35,6 +36,7 @@ function removePrivateFields(apiConfig) {
     return apiConfig;
 }
 
+// eslint-disable-next-line no-unused-vars
 function injectPrivateFields(newConfig, currentConfig) {
     // in-place injection of tokens and api keys which came in with domains.SECRET_PLACEHOLDER
 }
@@ -48,7 +50,7 @@ function upload(apiConfig, backupFilePath, sourceStream, callback) {
     // Result: none
     // sourceStream errors are handled upstream
 
-    callback(new Error('not implemented'));
+    callback(new BoxError(BoxError.NOT_IMPLEMENTED, 'upload is not implemented'));
 }
 
 function download(apiConfig, backupFilePath, callback) {
@@ -57,7 +59,7 @@ function download(apiConfig, backupFilePath, callback) {
     assert.strictEqual(typeof callback, 'function');
 
     // Result: download stream
-    callback(new Error('not implemented'));
+    callback(new BoxError(BoxError.NOT_IMPLEMENTED, 'download is not implemented'));
 }
 
 function downloadDir(apiConfig, backupFilePath, destDir) {
@@ -87,7 +89,7 @@ function listDir(apiConfig, dir, batchSize, iteratorCallback, callback) {
     assert.strictEqual(typeof iteratorCallback, 'function');
     assert.strictEqual(typeof callback, 'function');
 
-    callback(new Error('not implemented'));
+    callback(new BoxError(BoxError.NOT_IMPLEMENTED, 'listDir is not implemented'));
 }
 
 function remove(apiConfig, filename, callback) {
@@ -97,7 +99,7 @@ function remove(apiConfig, filename, callback) {
 
     // Result: none
 
-    callback(new Error('not implemented'));
+    callback(new BoxError(BoxError.NOT_IMPLEMENTED, 'remove is not implemented'));
 }
 
 function removeDir(apiConfig, pathPrefix) {
@@ -106,7 +108,7 @@ function removeDir(apiConfig, pathPrefix) {
 
     // Result: none
     var events = new EventEmitter();
-    process.nextTick(function () { events.emit('done', new Error('not implemented')); });
+    process.nextTick(function () { events.emit('done', new BoxError(BoxError.NOT_IMPLEMENTED, 'removeDir is not implemented')); });
     return events;
 }
 
@@ -116,6 +118,6 @@ function testConfig(apiConfig, callback) {
 
     // Result: none - first callback argument error if config does not pass the test
 
-    callback(new Error('not implemented'));
+    callback(new BoxError(BoxError.NOT_IMPLEMENTED, 'testConfig is not implemented'));
 }